Procedure Guide - 3M...excellent gingiva retraction with or without cord and haemostasis....

Impression Procedure Guide

3M Oral Care

Causes and Solutions.This trouble shooting guide helps identify common impression problems, determine potential causes and provide solutions to get your impression procedure under control.

10 Golden Rules.For perfect impressions.

Distortions. Wash material displaced.

Show-through of tray.

Facial-oral flow defects.

Incomplete reproduction of preparation margins.

Voids on the margin.

Tearing at the margin.

Margins complete but not sharp.

Impression material not completely set.

Stone cast discrepancies.

Poor bond between tray and wash material.

Poor bond of impression material to the tray.

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CausesIncomplete reproduction of preparation margins.

Blood and saliva contamination around preparation

Working time exceeded, flowability already impaired

Inadequate coverage of marginal area with light body impression material:

- Wash material displaced/washed away from preparation margins when applying 1-step technique

- Initial impression not sufficiently carved when applying 2-step technique

Impression material has low tear resistance

Insufficient retraction

Overview


Solutions

What to do.Retract gingival tissue to entirely capture the prepared area. Retraction cords as well as retraction pastes are suitable.

3M™ Astringent Retraction Paste sup ports your impression work with excellent gingiva retraction with or without cord and haemostasis.


View full technique guide for 3M™ Astringent Retraction Paste

Overview

How to use 3M™ Astringent Retraction Paste

https://multimedia.3m.com/mws/media/1053981O/how-to-use-3m-espe-retraction-capsule.mp4


Solutions

What to do.Rinse and dry the prepared area and stop any bleeding by using appropriate retraction technique and a haemostatic agent. Liquids or pastes based on aluminum chloride, aluminum sulfate, or iron sulfate are suitable haemostatic agents.




3M™ Astringent Retraction Paste: How it works

Overview

https://multimedia.3m.com/mws/media/1053983O/3m-espe-retraction-capsule-how-it-works.mov


SolutionsWorking time exceeded, flowability already impaired

What to do.Select material with sufficient working time (i.e. regular set instead of fast set). Make a choice depending on the individual situation and preference of material. Do not exceed working times given in the instructions for use. In case of 3M impression materials follow given intra-oral syringing times for wash materials.Pay attention to storage temperature. Working times are reduced due to higher temperatures of the product, while intra-oral setting times might be longer if the temperature of the product is lower.3M™ Impregum™ Polyether Impression Material offers a very long working time with constant flow, ideal for large cases. For smaller cases, the “Super Quick” materials provide 45 seconds working time combined with a superfast 2-minute set time. Polyether impression materials in general are less temperature sensitive in its setting reaction than VPS materials.3M™ Imprint™ 4 VPS Impression Material offers both a fast and a regular setting material. Select Quick Set for 1 to 2 unit cases and Regular Set for cases that involve 3 or more units.

Overview


SolutionsInadequate coverage of marginal area with light body impression material

What to do.Use wash material liberally on preparation and abutments.

- When using 1-step technique: Avoid high viscosity contrast between tray and wash material. Especially, when using putty materials combine them with a high viscosity wash material. In general, follow manufacturers’ recommendations for material combinations.

- When using 2-step technique: Carve tray material before applying wash material or use foil as spacer.

View recommended material combinations for 3M™ Imprint™ 4 VPS Impression Materials and 3M™ Impregum™ Polyether Impression Materials:

Overview


Solutions

Highly detailed impressions made with 3M™ Impregum™ Polyether Impression Material (left) and 3M™ Imprint™ 4 VPS Impression Material (right).

What to do.Let the material completely set prior to removal of the impression and use impression material with sufficient tear resistance.

All 3M precision impression materials offer clinically proven tear resistance.

View working and setting times of 3M™ Imprint™ 4 VPS Impression Materials and 3M™ Impregum™ Polyether Impression Materials:


Overview

CausesVoids on the margin. Improper syringe technique



Tray not seated properly

Storage at elevated temperature

Air bubbles in elastomer syringe or intra-oral syringe

Overview


SolutionsBlood and saliva contamination around preparation

What to do.Rinse and dry the prepared area properly and stop any bleeding by using appropriate retraction/haemostatic agents. Liquid haemostatic agents and pastes based on aluminum chloride, aluminum sulfate or iron sulfate are suitable.

3M™ Astringent Retraction Paste supports your impression work with excellent gingiva retraction with or without cord and haemostasis.



Overview



SolutionsImproper syringe technique

What to do.Keep the mix tip permanently immersed in the paste to avoid the formation of air bubbles. Apply a liberal amount of wash material into the sulcus. Start from the bottom up and cover the whole abutment tooth with syringing material. Always keep the tip in close proximity to the surface.

3M™ Intra-oral Syringes Green (for VPS materials) and Purple (for polyether) are easy to handle and give better control of the syringing process.

Application of wash material using 3M™ Intra-oral Syringe Purple

View full technique guide for 3M™ Intra-oral Syringes Green/Purple

Overview

https://multimedia.3m.com/mws/media/1631223O/3m-intra-oral-syringe-wash-application.mp4




Overview


SolutionsAir bubbles in elastomer syringe or intra-oral syringe

What to do.Bleed cartridge prior to loading syringe.

Keep flow of material consistent. Do not stop and start while loading the syringe.

How to load 3M™ Intra-oral Syringe Green/Purple

Overview

View full technique guide for 3M™ Intra-oral Syringe Green/Purple

https://multimedia.3m.com/mws/media/1053978O/how-to-load-3m-espe-intra-oral-syringe-green-purple.mp4


Solutions

What to do.Slowly (approx. 5 seconds) insert the loaded tray into the mouth parallel to the long axes of the prepared teeth, and hold it in place without applying pressure.

Maxillary arch: Seat the impression straight up. Make sure the handle is aligned with the patient‘s midline. Always hold the impression tray in the premolar area for stability.

Mandibular arch: Seat the impression straight down over the arch while pulling out the patient‘s cheek. Make sure the tray handle is aligned with the patient‘s midline. Apply passive pressure in the premolar areas with your thumbs for stability.


TIPS!

Overview


Solutions

What to do.Slowly (approx. 5 seconds) insert the loaded tray into the mouth parallel to the long axes of the prepared teeth, and hold it in place without applying pressure.

Maxillary arch: Seat the impression straight up. Make sure the handle is aligned with the patient‘s midline. Always hold the impression tray in the premolar area for stability.

Mandibular arch: Seat the impression straight down over the arch while pulling out the patient‘s cheek. Make sure the tray handle is aligned with the patient‘s midline. Apply passive pressure in the premolar areas with your thumbs for stability.


Overview

Apply passive pressure while holding the impression tray in place.

Never ask the patient to hold the tray.

Never ask the patient to bite down on the tray.

TIPS!


Solutions

What to do.Store impression material at room temperature. Usually, times given in the manufacturers’ instructions for use are valid for a storage temperature of 23 °C/74 °F. Working times are reduced due to higher temperatures of the product, while intra-oral setting times might be longer if the temperature of the product is lower.

Due to its lower temperature sensitivity, 3M™ Impregum™ Polyether Impression Material is less affected by fluctuations in storage temperature than VPS materials.

Storage at elevated temperature

Overview

Causes


Inhibition of setting due to use of acidic retraction materials/haemostatic agents like aluminum or ferric saltsSmear layers from custom temporary, provisional cements (acrylics) or core build-up present



Inhibition of setting of VPS impression materials due to contact with sulfur from latex gloves

Inadequately mixed materials

Premature removal of the impression

Expired impression material

Overview


Solutions






Overview



Solutions

What to do.Thoroughly rinse preparation with water and dry before taking the impression.

Inhibition of setting due to use of acidic retraction materials/haemostatic agents like aluminum or ferric salts


Rinse and dry preparation

Overview

https://multimedia.3m.com/mws/media/1053979O/rinse-and-dry-preparation.mp4


SolutionsSmear layers from custom temporary, provisional cements (acrylics) or core build-up present

What to do.Smear layers from acrylates (e.g. core build-up or temporary materials) can inhibit the setting of impression materials. When core build-up and final impression are made in one appointment:

- Be sure to remove the smear layer completely prior to impression taking with alcohol/by polishing. Check surrounding teeth and tissue for any residue.

When the temporary and final impressions are made in one appointment:

- Fabricate the provisional after taking the final impression or remove the air-inhibited layer on the exposed preparation with alcohol before taking the final impression.

- Do not use impressions already used to fabricate the provisional for subsequent precision impression taking.

- If a temporary is removed prior to impression taking: Remove all residues of cement and clean the abutment tooth. In case of a core build-up remove the air-inhibition layer on the exposed preparation with alcohol before taking the final impression.

Overview


Solutions

What to do.Bleed cartridge before applying the mix tip to ensure even dispensing. Then use the mix tips recommended by the manufacturer and dispense a pea-sized amount onto a mix pad prior to use.

Inadequately mixed materials


Bleed syringe

Overview

https://multimedia.3m.com/mws/media/1053980O/bleed-cartridge.mp4


Solutions

What to do.Follow manufacturer’s instructions for intra-oral setting time and make sure that the impression material has completely set before removal.

Store impression material at room temperature. Usually, times given in the manufacturer’s instructions for use are valid for a storage temperature of 23 °C/74 °F.

Working times are reduced due to higher temperatures of the product, while intra-oral setting times might be longer if the temperature of the product is lower.



Overview


Solutions

What to do.Use gloves which do not contain traces of sulfur, e.g. nitrile gloves.


Overview


Solutions





Overview


Solutions

What to do.Do not use expired impression material.

Follow defined storage conditions for materials given in the instructions for use for full shelf life.


Overview

Causes




Thick blood/saliva pooled around the preparation

Incorrect storage conditions of the final impression

Impression material stored at too low temperature



Inadequate disinfection

Overview


Solutions






Overview



SolutionsInsufficient retraction





Overview



SolutionsInhibition of setting due to use of acidic retraction materials/haemostatic agents like aluminum or ferric salts




Overview



Solutions



Overview




Overview


SolutionsImpression material stored at too low temperature

What to do.Temperature influences the viscosity. Store impression material at room temperature. Lower temperatures might lead to higher viscosities.

Overview


SolutionsIncorrect storage conditions of the final impression

What to do.After disinfection rinse impressions with water and dry before sending it to the lab.

Store impressions at room temperature and away from direct sunlight.

Overview


SolutionsInadequate disinfection

What to do.Use recommended disinfectants. Follow the manufacturers’ instructions for use. Do not exceed the immersion time.

Overview

Causes

Distortions.

2-step technique:

Distortions during impression removal

Delamination of impression material and tray

Lack of support/insufficient stabilization of the tray by operator during the initial phase of polymerization

Selected impression tray is too flexible

The combination of the tray and impression material is not appropriate


A high viscosity wash material can displace the tray material which has already set

Delamination of tray and wash material

Tray material used is too flexible and distortion occurs during second impression

Local distortions due to insufficient carving

Detachment of tray material from tray during carving

Overview

Distortions.



Overview

Distortions.

SolutionsLack of support/insufficient stabilization of the tray by operator during the initial phase of polymerization

What to do.Support tray until impression material is sufficiently set. Stabilize the tray after seating, avoid any movements.

When taking an impression of the upper jaw, you can easily find support on the chin or cheek bone of the patient.

With impressions of the lower jaw it is recommended to support the tray on the mandibula.

Patients should close their mouth as much as possible without biting down on the tray to avoid deformation of the mandibula and, thus, errors in the impression. Do not try to correct the position of the tray after insertion.

3M™ Imprint™ 4 VPS Impression Material has the fastest intra-oral setting time which means less time for unintended movements.

Overview

Distortions.

SolutionsDistortions during impression removal

What to do.Ensure the impression tray is the proper size prior to taking the impression and the material has excellent elastomeric properties.

Remove the impression along the axis of the prepared tooth.

Follow manufacturer’s instructions for intra-oral setting time and make sure that the impression material has completely set before removal.

Overview

Distortions.

SolutionsDelamination of impression material and tray

What to do.Use tray adhesive for all types of impression trays and apply adhesive on bottom and on inner sides of the tray, including gauze of dual-arch trays.

Alternatively use 3M™ Impression Trays: With their integrated self-retentive fleece strip, the application of a tray adhesive is not needed – saving valuable preparation time.

Overview

Distortions.

SolutionsSelected impression tray is too flexible

What to do.Use rigid trays. When using dual-arch trays, impression materials with low flexibility and high shore hardness are beneficial to stabilize the impression.

Both 3M™ Impregum™ Polyether Impression Material and 3M™ Imprint™ 4 VPS Impression Material offer heavy-body material options that are suitable to be used with 3M™ Dual Arch Impression Trays.

Overview

Distortions.

SolutionsThe combination of the tray and impression material is not appropriate

What to do.Do not use highly viscous putty materials in combination with flexible plastic trays. Dual-arch trays can be deformed during impression taking.

Overview

Distortions.

SolutionsDelamination of tray and wash material (2-step technique)

What to do.Clean the initial impression with plenty of water (or alcohol) and air. During this procedure, saliva has to be removed completely from the impression.

Dry thoroughly before taking the second impression. Do not forget to clean and dry after try-in of first impression.

Overview

Distortions.

Solutions

All interfering areas have been cut with a scalpel to enable easy re-insertion. Also channels are carved in order to allow excess wash material to be displaced.

A high viscosity wash material can displace the tray material which has already set (2-step technique)

What to do.Use low viscosity wash materials which are able to form very thin layers. Carve the first impression with tray material properly before applying wash material.

3M gives recommendations for optimised impression material combinations. View recommended material combinations for 3M™ Imprint™ 4 VPS Impression Material:

Overview

Distortions.

SolutionsTray material used is too flexible and distortion occurs during second impression (2-step technique)

What to do.Use a material with low flexibility and high hardness after set, e.g. 3M™ Imprint™ 4 Penta™ Putty VPS Impression Material.

Overview

Distortions.

Solutions


Local distortions due to insufficient carving (2-step technique)

What to do.Carve the tray material properly. Check repositioning prior to taking the second impression. Apply controlled pressure by slow and straight tray insertion.

Overview

Distortions.

SolutionsDetachment of tray material from tray during carving (2-step technique)

What to do.Apply adhesive on bottom and on inner sides of the tray. Use a sharp carving instrument to minimize stress at the interface of tray material and tray. Otherwise, tray material could detach from the tray unnoticed and causes deformation.

Overview


Causes

Impression tray does not support the flow of impression material

Insufficient amount of impression material used


Too fast tray insertion

Tray repositioning after seating

Overview




Overview


SolutionsImpression tray does not support the flow of impression material

What to do.Use rigid trays with correct size. If necessary, apply facial/oral, occlusal or dorsal stops.

Use 3M™ Impression Trays (or custom trays) that support the flow of the impression material. Their directed flow design minimizes flow defects and distal voids to improve impression accuracy.

Overview


SolutionsInsufficient amount of impression material used

What to do.Do not underfill the tray. Use sufficient material to create a back flow effect. If required, block out the palatal area of the tray.

Tray filling using 3M™ Pentamix™ Lite Automatic Mixing Unit

Overview

https://multimedia.3m.com/mws/media/1053982O/tray-filling-using-pentamix-lite-automatic-mixing-unit.mp4


SolutionsToo fast tray insertion

What to do.Insert the tray slowly, taking at least 5 seconds, to reduce flow defects.

Overview


SolutionsTray repositioning after seating

What to do.Stabilize the tray after seat-ing, avoid any movements. When taking an impression of the upper jaw, you can easily find support on the

chin or cheek bone of the patient.

With impressions of the lower jaw it is recommended to support the tray on the mandibula.



If you prefer using a polyether material, 3M™ Impregum™ Super Quick Material offers you the performance and reliability of a polyether together with the speed of a VPS.

Overview

Causes


Too much pressure applied upon seating of the tray

Lack of support of the tray by operator during the initial phase of polymerization

Tooth or tissue contact with impression tray

Insufficient amount of impression material used

Overview


SolutionsTooth or tissue contact with impression tray

What to do.Use stock trays with correct size or custom trays. If necessary, apply facial/oral, occlusal or dorsal stops.

Use 3M™ Impression Trays that support the flow of the impression material. Their directed flow design minimizes flow defects and distal voids to improve impression accuracy.

Overview


SolutionsToo much pressure applied upon seating of the tray

What to do.Apply controlled pressure upon seating the tray and hold it in place without exerting additional pressure to avoid contact between teeth/tissue and bottom of tray.

Maxillary impression: Place index and middle fingers in the premolar area for stability. Never hold impression by the

handle. Bring arms to your side to give more support.

Mandibular impression: Always line up tray handle to the patient’s midline. Hold tray with thumbs and take fingers

under the patient’s chin to stabilize the impression. Remember impression materials are spongy and can lift if not stabilised.

Overview


SolutionsLack of support of the tray by operator during the initial phase of polymerization

What to do.Support tray until impression material is sufficiently set. Stabilize the tray after seating, avoid any movements. When taking an impression of the upper jaw, you can easily find support on the chin or cheek bone of the patient.

With impressions of the lower jaw it is recom-mended to support the tray on the mandibula.



If you prefer using a polyether material, 3M™ Impregum™ Super Quick Material offers you the performance and reliability of a polyether together with the speed of a VPS.

Overview


SolutionsInsufficient amount of impression material used

What to do.Do not underfill the tray. Use sufficient material to create a back flow effect. If required, block out the palatal area of the tray.

Tray filling using 3M™ Pentamix™ Lite Automatic Mixing Unit

Overview

https://multimedia.3m.com/mws/media/1053982O/tray-filling-using-pentamix-lite-automatic-mixing-unit.mp4

Causes

Wash material displaced.

Contrast in viscosity between tray and wash material too high

Working time of tray material exceeded, viscosity already impaired

Insufficient amount of wash material applied

Overview


SolutionsInsufficient amount of wash material applied




Overview



SolutionsContrast in viscosity between tray and wash material too high

What to do.Avoid high viscosity contrast between tray and wash material. Especially, when using putty materials combine them with a high viscosity wash material. In general, follow manufacturers’ recommendations for material combinations.

All 3M impression materials are offered in well aligned consistencies. View recommended material combinations here:

Overview


SolutionsWorking time of tray material exceeded, viscosity already impaired


Overview

Causes


Inhibition of setting due to use of acidic retraction materials/haemostatic agents like aluminum or ferric saltsInhibition of setting of VPS impression materials due to contact with sulfur from latex gloves

Inadequately mixed material


Impression material stored at too low temperature

Smear layers from custom temporary, provisional cements (acrylics) or core build-up present

Premature removal from the mouth

Overview


SolutionsInadequately mixed material



Bleed syringe

Overview







Overview



SolutionsInhibition of setting of VPS impression materials due to contact with sulfur from latex gloves


Overview


SolutionsSmear layers from custom temporary, provisional cements (acrylics) or core build-up present

What to do.Smear layers from acrylates (e.g. core build-up or temporary materials) can inhibit the setting of impression materials. When core build-up and final impression are made in one appointment:

- Be sure to remove the smear layer completely prior to impression taking with alcohol/by polishing. Check surrounding teeth and tissue for any residue.

When the temporary and final impressions are made in one appointment:

- Fabricate the provisional after taking the final impression or remove the air-inhibited layer on the exposed preparation with alcohol before taking the final impression.

- Do not use impressions already used to fabricate the provisional for subsequent precision impression taking.

- If a temporary is removed prior to impression taking: Remove all residues of cement and clean the abutment tooth. In case of a core build-up remove the air-inhibition layer on the exposed preparation with alcohol before taking the final impression.

Overview


SolutionsPremature removal from the mouth

What to do.Follow manufacturer´s instructions for intra-oral setting time and make sure that the impression material has completely set before removal.




Overview


SolutionsImpression material stored at elevated or too low temperature

What to do.Store impression material at room temperature. Usually, times given in the manufacturers’ instructions for use are valid for a storage temperature of 23 °C/74 °F. Working times are reduced due to higher temperatures of the product, while intra-oral setting times might be longer if the temperature of the product is lower.

Due to its lower temperature sensitivity, 3M™ Impregum™ Polyether Impression Material is less affected by fluctuations in storage temperature than VPS materials.

Overview


SolutionsExpired impression material

What to do.Do not use expired impression material.

Follow defined storage conditions for materials given in the manufacturers’ instructions for use for full shelf life.

Overview

Causes


Initial impression not completely cleaned and dried (2-step technique)

Sulfur or acrylic contamination of set initial impression (2-step technique)

Working time exceeded

Relining of impression to correct defect in the impression

Overview


SolutionsWorking time exceeded


Overview


SolutionsInitial impression not completely cleaned and dried (2-step technique)

What to do.Clean the initial impression with plenty of water (or alcohol) and air. During this procedure, saliva has to be removed completely from the impression.

Dry thoroughly before taking the second impression. Do not forget to clean and dry after try-in of first impression.

Overview


SolutionsSulfur or acrylic contamination of set initial impression (2-step technique)


Do not use impressions already used to fabricate the provisional restoration for subsequent precision impression taking.

Overview


SolutionsRelining of impression to correct defect in the impression

What to do.Do not try to reline impressions. This can lead to distortions and poor bond between new wash material and set material. Repeat the impression instead.

Overview


Causes

Inadequate layer of tray adhesive

Smear layer on custom trays

No tray adhesive used

Tray distortion upon removal

Detachment of tray material from tray during carving (2-step technique)

Overview


SolutionsNo tray adhesive used

What to do.Use tray adhesive for all types of impression trays and apply adhesive on bottom and on inner sides of the tray, including gauze of dual-arch trays.

Polyethers and VPS impression materials have different and specific tray adhesives. Make sure that the proper tray adhesive is being used for the impression material.

Alternatively use 3M™ Impression Trays: With their integrated self-retentive fleece strip, the application of a tray adhesive is not needed – saving valuable preparation time.

Overview


SolutionsInadequate layer of tray adhesive

What to do.Follow manufacturer’s instructions for use for application and drying time.

Overview


SolutionsSmear layer on custom trays

What to do.Remove smear layer with acetone, grinding instruments or sandblast. Always make sure to clean trays after mouth try-in.

Overview


SolutionsTray distortion upon removal

What to do.Use stiff and rigid trays and make sure the tray fits well.

Ensure the impression tray is the proper size prior to taking the impression.

Remove the impression along the axis of the prepared tooth.

Overview


SolutionsDetachment of tray material from tray during carving (2-step technique)

What to do.Apply adhesive on bottom and on inner sides of the tray. Use a sharp carving instrument to minimize stress at the interface of tray material and tray. Otherwise, tray material could detach from the tray unnoticed and causes deformation.

Overview

Causes


Bump/swelling in gypsum model

Cast not made according to preparation guidelines and lacks detail

Outgassing of hydrogen when using VPS impression materials

Overview


SolutionsOutgassing of hydrogen when using VPS impression materials

What to do.Follow manufacturer’s instructions for use on minimum waiting time to pour cast.

Overview


SolutionsBump/swelling in gypsum model

What to do.Can occur through invisible voids under the surface of the impression. Thoroughly inspect the impression to avoid undetected voids.

Automatic mixing of impression materials with the 3M™ Pentamix™ 3 or 3M™ Pentamix™ Lite Mixing Unit guarantees homogeneous and void-free mixing results.

3M™ Pentamix™ Lite Automatic Mixing Unit

3M™ Pentamix™ 3 Automatic Mixing Unit

See the difference: Handmix vs. automix

Overview

https://multimedia.3m.com/mws/media/1053977O/automatic-mixing-of-impression-materials-with-pentamix-lite.mp4


SolutionsCast not made according to preparation guidelines and lacks detail

What to do.Provide all relevant information to the dental lab: Impression material used including fabrication date, additional surfactants for pouring if needed, etc.

Overview


01. Choose appropriate tray/wash materialviscosities and material class according to impression technique and indication. Use properly fitting, rigid, and sturdy impression trays.

02. Ensure adequate retractionand, if necessary, stop any bleeding to achieve a clean and dry situation. If retraction agents are used, rinse and dry thoroughly.

03. Thoroughly apply tray adhesive and let dry appropriately to make sure that the impression material will not be detached upon tray removal. Alternatively use a 3M™ Impression Tray. Due to its integrated self-retentive fleece strip a tray adhesive is not needed.

04. Assure a uniform and homogeneous mixof the impression material. Fill the tray sufficiently with the impression material. With all Penta™ materials and materials in Garant™ cartridges from 3M proper automatic mixing is guaranteed.

05. Use gloves that do not inhibit the setting of the impression material. Latex gloves can inhibit the setting of VPS impression materials, use nitrile gloves instead.

06. Keep the tip immersed in the material at all times during intra-oral syringing of the wash material to avoid entrapping air.

07. Slowly insert the loaded tray into the mouth parallel to the long axes of the prepared teeth. Apply controlled pressure upon seating the tray to avoid contact between teeth/tissue and bottom of tray. Stay within working time of tray and wash material. Hold the tray in place without exerting pressure and avoid any movements that could shift the position of the tray and may lead to distortions.

08. When removing the trayfrom the mouth avoid unilateral rotation. Follow the setting times indicated in the manufacturer´s instructions for use before removing the impression.

09. Check preparation marginsand make sure that margins are captured entirely and properly. The following appearances may lead to inaccurate results: voids, tears, material distortions, flow defects, detachment from tray, delamination between heavy and light body, shine-through of tray.

10. Disinfect impression properlyand according to the manufacturer’s instructions for use. Rinse impression with water before and after disinfection and dry before sending it to the lab.

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3M ESPE Dental2510 Conway AvenueSt. Paul, MN 55144-1000 USA1-800-634-2249

3M CanadaPost Office Box 5757London, Ontario N6A 4T1 Canada1-888-363-3685

Customer Care Center: 1-800-634-2249 3M.com/GreatImpressions

3M, Impregum, Imprint, Penta and Pentamix are trademarks of 3M or 3M Deutschland GmbH. Used under license in Canada.

© 3M 2019. All rights reserved. (Rev. 1/2019)

Appendix


Solutions






3M™ Astringent Retraction Paste

Completely remove astringent retraction paste with air-water spray and suction.

Optional: procedure with cords. For more gingival deflection, the astringent retraction paste can be used in combination with retraction cords.

Leave astringent retraction paste on for a minimum of 2 minutes.

Slowly and steadily, inject astringent retraction paste into sulcus. Completely fill the sulcus.

Remove a retraction capsule from the blister and insert into dispenser (fits into most composite dispensers). Extrude a small amount of paste and discard.

Insert retraction capsule tip into the sulcus.

Overview



Solutions













Overview



SolutionsInadequate coverage of marginal area with light body impression material


- When using 1-step technique: Avoid high viscosity contrast between tray and wash material. Especially, when using putty materials combine them with a high viscosity wash material. In general, follow manufacturers’ recommendations for material combinations.

- When using 2-step technique: Carve tray material before applying wash material or use foil as spacer.

View recommended material combinations for 3M™ Imprint™ 4 VPS Impression Materials and 3M™ Impregum™ Polyether Impression Materials:

Overview


Solutions






Overview


SolutionsBlood and saliva contamination around preparation

What to do.Rinse and dry the prepared area properly and stop any bleeding by using appropriate retraction/haemostatic agents. Liquid haemostatic agents and pastes based on aluminum chloride, aluminum sulfate or iron sulfate are suitable.











Overview



SolutionsImproper syringe technique

What to do.Keep the mix tip permanently immersed in the paste to avoid the formation of air bubbles. Apply a liberal amount of wash material into the sulcus. Start from the bottom up and cover the whole abutment tooth with syringing material. Always keep the tip in close proximity to the surface.

3M™ Intra-oral Syringes Green (for VPS materials) and Purple (for polyether) are easy to handle and give better control of the syringing process.


View full technique guide for 3M™ Intra-oral Syringes Green/Purple

Filling quantity for:3 – 4 teeth / 2 – 3 teeth / 1 – 2 teeth

max load

if overfilled safety valve opens for excess

clean before use!

overfilled

max load

Tips for success.

3M™ Intra-oral Syringe Green/Purple

Overview



SolutionsAir bubbles in elastomer syringe or intra-oral syringe

What to do.Bleed cartridge prior to loading syringe.

Keep flow of material consistent. Do not stop and start while loading the syringe.

How to load 3M™ Intra-oral Syringe Green/Purple


Filling quantity for:3 – 4 teeth / 2 – 3 teeth / 1 – 2 teeth

max load


clean before use!

overfilled

max load

Tips for success.


Overview

https://multimedia.3m.com/mws/media/1053978O/how-to-load-3m-espe-intra-oral-syringe-green-purple.mp4


Solutions













Overview



Solutions












Overview



SolutionsInadequately mixed materials



Bleed syringeif overfilled safety valve opens for excess

clean before use!

overfilled

max load

Tips for success.


Overview



Solutions

What to do.Follow manufacturer’s instructions for intra-oral setting time and make sure that the impression material has completely set before removal.





Overview


Solutions













Overview



SolutionsInsufficient retraction












Overview














Overview


Distortions.

SolutionsA high viscosity wash material can displace the tray material which has already set (2-step technique)


A high viscosity wash material can displace the tray material which has already set (2-step technique)

What to do.Use low viscosity wash materials which are able to form very thin layers. Carve the first impression with tray material properly before applying wash material.

3M gives recommendations for optimised impression material combinations. View recommended material combinations for 3M™ Imprint™ 4 VPS Impression Material:

Overview


SolutionsInsufficient amount of wash material applied





clean before use!

overfilled

max load

Tips for success.


Overview


Contrast in viscosity between tray and wash material too high




SolutionsOverview


SolutionsContrast in viscosity between tray and wash material too high



Overview


SolutionsInadequately mixed material



Bleed syringeif overfilled safety valve opens for excess

clean before use!

overfilled

max load

Tips for success.


Overview













Overview



SolutionsPremature removal from the mouth

What to do.Follow manufacturer´s instructions for intra-oral setting time and make sure that the impression material has completely set before removal.




Overview

Procedure Guide - 3M...excellent gingiva retraction with or without cord and haemostasis....

Documents

Transcript of Procedure Guide - 3M...excellent gingiva retraction with or without cord and haemostasis....